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A-type molecular sieve was synthesized from natural rectorite viawater-floatation, deferrization and hydrothermal process. X-ray diffraction andthe determination of the adsorption suggest that the obtained molecular sieve hasgood crystalline and adsorptive performance. The crystallization mechanismwas investigated. The variations in the basicity of the liquid components, thegrain size and Si/Al ratio during the crystallization were studied.